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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45582962ebc85f868f5bf794021de889e64d6edf452c8497009f7712ee16345' 
  AND token = '9HePNAYMtJ2tbdA8UTXTuct99ZgW2YL8Zx3UsSSOJ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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