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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85aa7c21c1b9c1aed934eb023a77e8c279bd8d2eec1fc7d6897747a0efdd7c4a' 
  AND token = 'AZDOUJkFCqYpIO5DWRqUhATzlJNjjtE3VU98XyD8W/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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