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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7ffc4989d0f1eca4f9b5c873e78066dde8055b029dd9ece0eb2f1615a8bd64' 
  AND token = 'TLvO3EE+ek5shm9ixarr21Y4ahD004EIWSI0xXuOnz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}