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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b108763e89f38436a22d550ffc7cc496b813f97ddb0744aa7074ceb9f72c230' 
  AND token = 'XNoOoNyXWvllOVZmW6ztytwQt4O/Gkn1sudZftWZz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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