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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73751cb1fcf4e74ac4e8412207d31ef83ee265ecfd5e4acbab2413fd9f1f3f6a' 
  AND token = 'dUk8Pkvo/nbwZFa0EwhhRYnaYUxbv675wSbTFRtE9Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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