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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a01c3cacb0100a9a54d40ae64e4506bea50909d7d7024199c15e71c5a378a39' 
  AND token = 'Ov7YXRuA0uH3VkdcyOl7F3QjKk1dPVwycllLUBe47D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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