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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c3c71eff378c74b61d8a8a278de3bfae56a48bc063f074ce5935445560e670' 
  AND token = 'yixPeY8gXmKUcOuXdhERHVgsJA8Usj56CGkJcb3zwkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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