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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1431520e15676dad5eb03731f7ae94c74bdce10a46f56c32af2b3f1d6c60651f' 
  AND token = '0ssujmPEB5W+/ADfeXIKj+TZtuE+NFj7Enm38Y94rtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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