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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ae31e7184f3bdfffc9ffd27df1e5deaf10f9d97af47836f894c8df2dfeb96d' 
  AND token = '6FrdLLd/P/y7BjYUZKKk4uvkTxQBHnYe6Wi13RTF2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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