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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8baa8b385b0cd5115e96156ef29ec294e6d7f1327aa27b8cb6553cd5f757e1a9' 
  AND token = '1RIu1u0G1lk54ptYF0P5kQ2SdUNANFrTgsgZUI5bA8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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