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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454fa236723b190e79e69f6903069ff20a189b3d82d07c8c79077e8f2e867dcc' 
  AND token = 'cTBDMRcp8Zx3GNakPmzCwz/mw3F0A6Q+W3eRPyzwtFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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