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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd3af4fa9b639eb548a2ef70d6590856bf7624e94c8d084ae8a8158f2e93eaa' 
  AND token = 'pKxapNXFrdE0rHpvictpejnCQrzJuxxgW/wPUCM7edw=' 
  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"
    }
  }
}