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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc23b30918b50ae7bf6e5d1c8e25c186b8248577a930bd35b321dd29494e333f' 
  AND token = 'TbUIw36gE+0Uu9WYD/bPP78/0cvDtEcCTPJgqGCbXkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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