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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2021840c5d49044da51e32a8464a16152c8510963f28a794c54d58b5396c5ed9' 
  AND token = '7T3h/O9vOwn0DQLW7h/TE35QiMmu8+6UefLrVHtBkU4=' 
  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"
    }
  }
}