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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935c8e28168723474b47c857d5d08f87e07185ba9555f8e48acc608d09646b17' 
  AND token = 'lJWaqP4rv3jc5abq12pfUcl9CyNXIrH5Omm3A2o9sCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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