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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa7422865a2c1625dff35ebcde5396e67ef7671dd594a12189f36d4a4e107c2' 
  AND token = 'Mgr1Az2OmhmO/D5xyqn69fJGidwZQE30DUgkD5OdFN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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