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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a27c7eba8086a5b8a5469424cf66b188b6ac99746dbb9783e6da1c8fe3cd10f' 
  AND token = 'lsvzBNurMAt/Sj99d3ELCHoZYJ6s71UvF+TXmur8/PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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