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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86272ca053c62fe4080ddee0270b759a2e2f34da7c684f7f2fb8fc1b45f3986d' 
  AND token = 'yCtBHq9X+tPtIutDkRCSKdB+kzz20e8cDVkqSa84grg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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