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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c16df30c3771fc104edbc493832e99dca4b6e4c016ca609bd9563bfa7a343fb' 
  AND token = '6+nndPPZ4d8L7D+n/Jv3l93VSB4XtnlHdXp0NYUTWGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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