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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14200ba23b1abc8671b89e4a22b7d9f1e7ea735012437467c6dd9687e307dd3f' 
  AND token = '5RMQzJ1b8lSC8s5kSoUXY+gxsOTE/9kWVKtBpicqYcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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