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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351758085d4a2a935b93ba0aebb8d080e37a29112c11e625d0fa87e0b7003ad3' 
  AND token = '/JCalYRA3LOGJA4ZpjKu8p/KoK4q0EiO6Szx/kAYJZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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