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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c90e7291cb72ccca3674a4a86c722f92164f8ce69a44344865847ff02010c6c' 
  AND token = '4x4Hpv/+eI1x3kkqw7xPmlpL1LdL1Pxf3pP2NdgHTe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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