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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899ccbcbcc1e0c9a50e9a4632b6590784630d58e375de981e0585418330e2ad2' 
  AND token = 'LW8G0mWCOAGotli3wY1bvL0fs53fQj98l9uQ1S3hjTU=' 
  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"
    }
  }
}