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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450eaf39a79c0f6b1722da234aa9400687fa8514150954a49096927fb2f5621c' 
  AND token = 'jDS3rp/NWDts9PqgtNd6W1Dv3ni6B/Iemfya9ihvkbI=' 
  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"
    }
  }
}