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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3f7f05cc285f2d7ce196880db2df5ba3d459dcf0ca5af2ebdbf42f93c6c2c0' 
  AND token = 'sCzSggNP0S4e8Tug9lt0RKqsju7m29v01sJZv/Mdzmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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