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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f5f04d374f98475ca2e97e1911c6e7834d3de845013715e7e7fe78b74e3928' 
  AND token = 'f13Hm7S4DDI5AEDh9OD6ZjkNevCvW/0ChgS+aZHx3V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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