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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196e35b8aa839c84993a0b77b9cc305602400d5c48ed31861ae63b23a5263e16' 
  AND token = 'Ibm1kohwa9JDdX9/2+lDgA6rYT8mHOMpJTWNjbmifro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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