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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255680dcae43ea9a0b6c88052b9e9c90ce9b073794f9e02ec954d68cd9356755' 
  AND token = '+AD/iXMPLT5mGa9nUNFOZQGOggTBo3ynqkD5Aopcj5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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