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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e57f93b52a8b7fec3d985113215d55ac2dd6d4efede9c4bd780da7cdaaa419' 
  AND token = 'dmlPC1j75m9O5+bREuC8RqYYJ5F+U7nb8zK+Lz//tfs=' 
  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"
    }
  }
}