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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3811c19e309ee61dd7a99ec23d473df2b3e123f7e1d990db2e1a9acc9bedd4' 
  AND token = 'zJVhcTIZWxWlO6E1qicpx8fI0KoQ7sNflVs1R1cmSCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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