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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aeb825fb6ae6a6fb38cfaff32c0921b85b2f11a080128a50925ab391c9a9e7' 
  AND token = 'QjQVN+sncVxTKy2m7Cc6AyIer02KEBDT8qNMN6J0Kbk=' 
  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"
    }
  }
}