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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e524c340ee3f4fa7a84d3ed379a98629dd39b251052b2781678b2c3f05f66652' 
  AND token = 'TB8nc5ZJutXjqXmyBn4Ks2CZ2Kubn61BnFs4BPRxzcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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