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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fcc3325a2e1b7cd44dff2f049159c4736d31160a9daaf65afde59b421ce99b' 
  AND token = 'c5aDH2o29t3g6fHudxbgQ3HxSuuS3Tp7IHVDVAabHOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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