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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e23f6c130e336dd9065a7cd56fc478319b62bd574cf057900185a45d664424e' 
  AND token = '23mceQ30rNbv3CHxeu0dcsYOTzAkMFItFzG7NgNaPk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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