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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b9d8d214414750fd805d4fe67c89cd3d387db7a2fdf44d92b064be0329720c' 
  AND token = 'UsKU1y1qM9H6KQSe2N44CGBMe2qmigKN8pbdH8EnOWE=' 
  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"
    }
  }
}