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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be2aebc249fc9ed74a7bd05fa8f49c7946d289c86a1b3f9d802ad1052be6d7c' 
  AND token = 'qnE46Kcq5gg3hQB+aQGKlr3OcYnyxS4j5ElcLdD01Ac=' 
  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"
    }
  }
}