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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c3a060155616a18a3dabc40bfe041bf6f451fc92ea3f0f811b96521acf86f5' 
  AND token = '6DirkJoMWHVI0s8zE4DBgTa2TmUvBxLGbxNjlSEB80k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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