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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd128d5b9e7e724e90cb52e212f01e69ec0c84fa1c004e40dc4d9166b9cdf9f8d' 
  AND token = '8gE0P+ECX0a3oym4YojL/mjZyZeSEamqVK+ZHkl8KRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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