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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec781079fcf546ebbd3e83d9319c4a01942de20f671ff7eff49c4cfcfa79e5b' 
  AND token = '3/O07Ihz9t3Ep6/dqES0y8v7x54SpEoaVBraOe1s26E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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