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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b48d62ef591d3e19a08c477c09ccd90bad684fdbf93d8e80f6d1f89a9b6b96' 
  AND token = '0JKhfLRWD/D6eaA88mJV3fN4yrb5kqCRzY3kxhuU2rA=' 
  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"
    }
  }
}