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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcf4249f8d9348d251b85c654256e23e21def4c75e907ff44f525e6f8859ad0' 
  AND token = 'uHkKy7233BomFcmGJyR0RIgkr2EkBNA1FhQ+FBb3J7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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