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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee6d2328f0bd6f4388acf7e8c09b6cd55b1e621d6ac422f6db71674df40196e' 
  AND token = 'L/NIsLSfPvnNagTbvwqvl/+qHMycTKKF5ToZNbu5xbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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