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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cc4efca6d7e76e835557b3c4bb1fe2e62ea6b9d22b4225a1615eed96d31a56' 
  AND token = '9nIQOmBrWRGkv9+hBmr3pN3F7BYHGqtzF+cPorxEvEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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