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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a20514d2411b40b37e52038363036afa5195c6e753cbcddeeed7d3565ad30fa' 
  AND token = 'DWRSe4Iq1rATf/ixp+12dSTwbhkf6J36czF/DeMGxXU=' 
  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"
    }
  }
}