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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9d61ac17cfa8f12fa324fa985944e1d7ff5fb219b119d35e1e79c5408b32ac' 
  AND token = '+HedfdVxdNww+nofFKYn+xKlvFh0zKoZ47KVMOQM9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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