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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00876109900563c5e6462720cf85d08b0456a65ae7668972f423f41ffdce2b2c' 
  AND token = 'dQ7+5P4MNVgx9DiPE9q0tdAnMBuNYzq8aRimSLU5oF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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