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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e119708d10d0bee0b5896e5b8eedc83a31dc3e661fedc01d55ff7a002ba65ea0' 
  AND token = 'erGv8DLg1+UFVE9a+rmX72JDJypl8ZuioIUbg2wripU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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