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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c13a8101b4cd4c6cce8a89366b7ee3fd5eca3057188b61711b01dc71df599c' 
  AND token = 'yI+etxhsgow2Dt6/uMJqBQOub7TZkX5yy1PHsUWHNNQ=' 
  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"
    }
  }
}