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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab775a08fdb9b529b08502a034a47a03db31041685e19f68cad281132adc820' 
  AND token = '1wNgfipzfa1rn1Z1w2A8R41n6RzNcU7STyyL0FThxBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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