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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa2addd9d4660d7c58a358c461e12a054b5ade4ce46d2808b1688a4353084d5' 
  AND token = 'grrGHttZ6zP9gSnAoeixriB8hB8BzqqCc4ys+7WwBkg=' 
  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"
    }
  }
}