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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea887cbac99e08e857ed0a46de8652d2e5c930071ffe37adb1f444c4fbcd094d' 
  AND token = 'jEsmv70Rq9PyD7Phyn41u+og4cKwWyBbr+Se9NIg/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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